#!/usr/bin/env bash

# Use this script to provision dependencies for your Zulip installation.
# This script is idempotent, so it can be restarted at any time, and it
# will usually run fairly quickly when your dependencies are up to date.

set -e
if [ "$EUID" -eq 0 ]; then
    echo "Error: The provision script must not be run as root" >&2
    exit 1
fi

os="$(. /etc/os-release && echo "$ID $VERSION_ID")"
case "$os" in
    'ubuntu 14.04' | 'ubuntu 16.04')
        echo "Error: $os is no longer a supported platform for Zulip." >&2
        if [ -e /home/vagrant ]; then
            # shellcheck disable=SC2016
            echo 'To upgrade, run `vagrant destroy`, and then recreate the Vagrant guest.' >&2
            echo 'See: https://zulip.readthedocs.io/en/latest/development/setup-vagrant.html' >&2
        fi
        exit 1
        ;;
esac

python_version="$(python3 --version)"
case "$python_version" in
    Python\ 3.[0-5].*)
        echo 'Error: Zulip requires an OS with Python 3.6 or later.' >&2
        exit 1
        ;;
esac

FAIL='\033[91m'
WARNING='\033[93m'
ENDC='\033[0m'

# Make the script independent of the location from where it is executed
PARENT_PATH=$(
    cd "$(dirname "${BASH_SOURCE[0]}")"
    pwd -P
)
cd "$PARENT_PATH"
mkdir -p ../var/log
LOG_PATH="../var/log/provision.log"

echo "PROVISIONING STARTING." >>$LOG_PATH

# PYTHONUNBUFFERED is important to ensure that tracebacks don't get
# lost far above where they should be in the output.
export PYTHONUNBUFFERED=1
./lib/provision.py "$@" 2>&1 | tee -a "$LOG_PATH"
failed=${PIPESTATUS[0]}

if [ "$failed" -ne 0 ]; then
    echo -e "$FAIL"
    echo "Provisioning failed (exit code $failed)!"
    echo
    echo "* Look at the traceback(s) above to find more about the errors."
    echo "* Resolve the errors or get help on chat."
    echo "* If you can fix this yourself, you can re-run tools/provision at any time."
    echo "* Logs are here: zulip/var/log/provision.log"
    echo -e "$ENDC"
    exit "$failed"
elif [ "$VIRTUAL_ENV" != "/srv/zulip-py3-venv" ] && [ -z "${SKIP_VENV_SHELL_WARNING}" ]; then
    echo -e "$WARNING"
    echo "WARNING: This shell does not have the Zulip Python 3 virtualenv activated."
    echo "Zulip commands will fail until you activate the virtualenv."
    echo
    echo "To update the shell, run:"
    echo "    source /srv/zulip-py3-venv/bin/activate"
    # shellcheck disable=SC2016
    echo 'or just close this shell and start a new one (with Vagrant, `vagrant ssh`).'
    echo -en "$ENDC"
fi
exit 0
